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Wildfire Alters the Structure and Seasonal Dynamics of Nocturnal Pollen‐Transport Networks

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Wildfire Alters the Structure and Seasonal Dynamics of Nocturnal Pollen‐Transport Networks This is a repository copy of Wildfire alters the structure and seasonal dynamics of nocturnal pollen‐transport networks. White Rose Research Online URL for this paper: https://eprints.whiterose.ac.uk/149103/ Version: Accepted Version Article: Banza, Paula, MacGregor, Callum James orcid.org/0000-0001-8281-8284, Belo, Anabela DF et al. (3 more authors) (2019) Wildfire alters the structure and seasonal dynamics of nocturnal pollen‐transport networks. Functional Ecology. ISSN 0269-8463 https://doi.org/10.1111/1365-2435.13388 Reuse Items deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing [email protected] including the URL of the record and the reason for the withdrawal request. [email protected] https://eprints.whiterose.ac.uk/ 1 Wildfire alters the structure and seasonal dynamics of nocturnal pollen-transport 2 networks 3 4 Running head: Wildfire affects nocturnal pollination 5 6 7 Paula Banzaa,b, Callum J. Macgregorc,d,e,f,1, Anabela D.F. Belog, Richard Foxe, Michael J.O. 8 Pocockd & Darren M. Evansc 9 a: Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Instituto de Investigação e 10 Formação Avançada, Universidade de Évora, Núcleo da Mitra, Ap. 94, 7006-554, Évora, 11 Portugal. 12 b: A Rocha Portugal, Mexilhoeira Grande, Portugal 13 c: School of Natural and Environmental Sciences, Newcastle University, Newcastle upon 14 Tyne, NE1 7RU, UK. 15 d: Centre for Ecology and Hydrology, Maclean Building, Benson Lane, Crowmarsh Gifford, 16 Wallingford, Oxfordshire, OX10 8BB, UK. 17 e: Butterfly Conservation, Manor Yard, East Lulworth, Wareham, Dorset, BH20 5QP, UK. 18 f: Department of Biology, University of York, Wentworth Way, York, YO10 5DD, UK. 19 g: Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Departamento de Biologia, 20 Escola de Ciências e Tecnologia, Universidade de Évora, Núcleo da Mitra, Ap. 94, 7006-554, 21 Évora, Portugal. 22 23 1: corresponding author. Current address: Department of Biology, University of York, 24 Wentworth Way, York, YO10 5DD, UK. Email: [email protected]. Tel: (+44) 25 01904 328623. No fax available. 26 27 1 28 Abstract 29 1. Wildfires drive global biodiversity patterns and affect plant-pollinator interactions, 30 and are expected to become more frequent and severe under climate change. Post-fire 31 plant communities often have increased floral abundance and diversity, but the effects 32 of wildfires on the ecological process of pollination are poorly understood. Nocturnal 33 moths are globally important pollinators, but no previous study has examined the 34 effects of wildfire on nocturnal pollination interactions. 35 2. We investigated the effects of wildfire on nocturnal pollen transport networks. We 36 analysed the abundance and species richness of moths and flowers, and the structure 37 of these networks, at three burned and three unburned sites in Portugal for two years, 38 starting eight months after a large fire. 39 3. Nocturnal pollen-transport networks had lower complexity and robustness following 40 the fire than at nearby unburned sites. Overall, 70% of individual moths carried 41 pollen, and moths were found to be transporting pollen from 83% of the flower 42 species present. Burned sites had significantly more abundant flowers, but less 43 abundant and species-rich moths. Individual moths transported more pollen in 44 summer at burned sites, but less in winter; however, total pollen-transport by the moth 45 assemblage at burned sites was just 20% of that at unburned sites. Interaction turnover 46 between burned and unburned networks was high. 47 4. Negative effects of fire upon moths will likely permeate to other taxa through loss of 48 mutualisms. Therefore, if wildfires become more frequent under climate change, 49 community resilience may be eroded. Understanding the responses of ecological 50 networks to wildfire can inform management that promotes resilience and facilitates 51 whole-ecosystem conservation. 2 52 Resumo Português (Second language abstract: Portuguese) 53 1. Os fogos florestais induzem padrões mundiais de biodiversidade, afectando as 54 interações planta-polinizador, e é expectável que se tornem mais frequentes e severos 55 num cenário de alterações climáticas. As comunidades vegetais do pós-fogo 56 apresentam frequentemente maior abundância e diversidade florística. No entanto, os 57 efeitos dos fogos florestais sobre o processo ecológico da polinização são pouco 58 conhecidos. Os lepidópteros nocturnos são polinizadores importantes a nível mundial, 59 mas apesar disso nenhum estudo escrutinou, até à data, os efeitos dos fogos florestais 60 sobre as interações produzidas entre as plantas e os polinizadores nocturnos. 61 2. Investigámos os efeitos dos fogos florestais nas redes de transporte de pólen por 62 polinizadores nocturnos. Analisámos a abundância e riqueza específica de traças e 63 plantas em flor, e a estrutura destas redes, em três áreas ardidas e três não ardidas em 64 Portugal, durante dois anos, com início oito meses após um grande fogo. 65 3. As redes nocturnas de transporte de pólen apresentaram menor complexidade e 66 robustez após o fogo quando comparadas com áreas próximas não ardidas. 67 Globalmente, 70% das traças transportavam pólen do qual 83% pertencia a plantas em 68 flor presentes no local. Nas áreas ardidas a floração foi significativamente mais 69 abundante, mas a abundância e a riqueza específica das traças foram menores. Nas 70 áreas ardidas, cada traça individualmente transportou mais pólen no Verão, mas 71 menos no Inverno; no entanto, o total de pólen transportado pelo conjunto das traças 72 foi de apenas 20% do das áreas não ardidas. O turnover das interações entre áreas 73 ardidas e não ardidas foi elevado. 74 4. Os efeitos negativos dos fogos sobre as traças irão provavelmente fazer-se sentir 75 noutros taxa em consequência da perda de mutualismos. Portanto, se os fogos 76 florestais se tornarem mais frequentes por causa das alterações climáticas, a 3 77 resiliência das comunidades pode ser afectada. Compreender as respostas das redes 78 ecológicas aos fogos florestais pode contribuir para uma gestão que promova a 79 resiliência e facilite a conservação do ecossistema como um todo. 80 81 82 Keywords 83 Disturbance, ecological networks, fire, flowering plants, Lepidoptera, Mediterranean, moths, 84 pollination 85 86 87 88 4 89 Introduction 90 Wildfire drives biodiversity patterns globally through heterogeneous disturbance regimes 91 (Kelly & Brotons, 2017). It is especially important within Mediterranean ecosystems (Faivre, 92 Roche, Boer, McCaw, & Grierson, 2011), where wildfires have become more frequent and 93 severe since the 1970s because agricultural abandonment has caused fuel accumulation 94 (Moreira, Rego, & Ferreira, 2001; Pausas & Fernández-Muñoz, 2011). Climate change is 95 expected to drive further increases in frequency and severity of fires (Flannigan et al., 2013). 96 Fires can shape plant-pollinator communities (Brown, York, Christie, & McCarthy, 2017; 97 Ponisio et al., 2016), leading to reduced abundance of pollinators and flowers (Potts, Dafni, 98 & Ne’eman, 2001) and reductions in plant reproductive success (Ne’eman, Dafni, & Potts, 99 2000), or increased floral resources through a flush of secondary succession (Capitanio & 100 Carcaillet, 2008; Potts et al., 2003). By altering community composition, fire may have 101 secondary effects on plant-pollinator networks (Welti & Joern, 2017), but no study has 102 investigated the direct effects of fire on plant-pollinator network properties (Brown, York, 103 Christie, & McCarthy, 2017). Ecological network metrics are increasingly used as tools for 104 biodiversity monitoring and assessment of environmental change (Derocles et al., 2018), 105 because they can describe important changes in the structure and function of whole 106 ecosystems that might not be detected by measuring species abundance and diversity. 107 Moths are potentially pollinators of global importance (Macgregor et al., 2019; Macgregor, 108 Pocock, Fox, & Evans, 2015), and may be especially important in the Mediterranean (Banza, 109 Belo, & Evans, 2015). They are in decline (Conrad, Warren, Fox, Parsons, & Woiwod, 110 2006), with probable drivers of those declines including habitat fragmentation, climate 111 change (Fox et al., 2014), and artificial light at night (Macgregor, Evans, Fox, & Pocock, 112 2017; van Langevelde et al., 2018). Wildfire may also affect moths; of the few studies of the 5 113 effects of wildfire upon Lepidoptera, most find negative impacts (Kral, Limb, Harmon, & 114 Hovick, 2017). Fire can lead to mortality of larvae through host plant destruction (Fowles, 115 Bailey, & Hale, 2004), subterranean pupae (Schmid, Thomas, & Rogers, 1981), and even 116 adults (Gerson & Kelsey, 1997). However, the effects of fire on moths and their pollen- 117 transport interactions at community-level have not been studied. 118 Here, we examined the response of nocturnal moth-plant interaction networks to a large fire 119 in southern Portugal. By assessing
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